Finding the Fourth Proportional to 2,170.90, 3,255.38 and 784.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,170.90 : 3,255.38 = 784.18 : x
2. Step 2: Convert to fraction form
   2,170.90/3,255.38 = 784.18/x
3. Step 3: Cross multiply
   2,170.90x = 3,255.38 × 784.18
4. Step 4: Simplify right side
   2,170.90x = 2,552,803.89
5. Step 5: Solve for x
   x = 2,552,803.89/2,170.90
6. Step 6: Final answer
   x = 1,175.92